As Terri and Jackie are running a race, their distances from the starting line varies, with Jackie pulling away from Terri during the entire race. If we let Terri's distance from the starting line (in meters) be represented byd_t

and Jackie's distance from the starting line (in meters) be represented byd_j.

Write an expression to represent 2.1 times as far as the distance Terri has run since she began the race.